A gamma ray or gamma radiation (symbol γ or ), is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei.It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy. Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900 while studying radiation emitted by radium.

Gamma-ray bursts were first observed in the late 1960s by the U.S. Vela satellites, which were built to detect gamma radiation pulses emitted by nuclear weapons tested in space. The United States suspected that the Soviet Union might attempt to conduct secret nuclear tests after signing the Nuclear Test Ban Treaty in 1963. On July 2, 1967, at 14:19 UTC, the Vela 4 and Vela 3 satellites ...

No dissent allowed A skeptical event during the big global warming conference in Poland was shut down by U.N. officials KATOWICE — The United Nations gave its blessing to a massive climate protest during the Trump administration’s pro-energy event today at the climate summit (COP24) in Poland, according to the U.S. delegation.

For more than 60 years, Ray Bradbury's science fiction classic Fahrenheit 451 has sparked imagination, debate, and rebellion. The dystopian story of a man who burns books to prevent the ...